Justin Bieber dropped down a notch on the Twitter pecking order over the weekend as Katy Perry beat him to become the social network’s most popular user.

Perry boasted 46.48 million Twitter followers on Sunday, according to CNBC, edging ahead of Bieber’s 46.47 million — which isn’t bad really, considering it’s only slightly less than the entire population of Spain.

But some are questioning just how many followers of both singers are real. StatusPeople reckons more than 40% of Bieber’s Twitter fans are fake, compared to 52% of Perry’s.

Bieber took over the most-followers title nine months ago, ending Lady Gaga’s two-year reign. Seven of the ten most followed Twitter users are musical artists, while the remaining three are Instagram, YouTube and U.S. President Barack Obama, according to CNBC.

Twitter is expected to go public on the New York Stock Exchange on Nov. 7.